How to make a fine -pounded strip foundation for a house made of aerated concrete

Aerated concrete has many benefits when building a home, including superior fire and thermal resistance. But it’s essential to build a strong foundation if you want your home to remain sturdy and steady for many years to come. A finely ground strip foundation is among the most dependable options. Aerated concrete homes are a great fit for this kind of foundation because of its affordability and longevity.

A continuous strip of fine-pounded concrete that encircles your home and serves as a strong foundation for the walls is known as a strip foundation. Its purpose is to evenly distribute the weight of the structure, avoiding any settling or shifting that might eventually lead to cracks or other damage. This kind of foundation works especially well in places with stable soil conditions.

Excavating the ground and pouring and curing the concrete are two of the most important steps in creating a fine-pounded strip foundation. Although it might appear like a difficult undertaking, motivated do-it-yourselfers can accomplish it with the correct equipment and a little knowledge. You can build a foundation for your aerated concrete home that will last for decades by using a methodical approach.

We’ll guide you through the steps of creating a finely ground strip foundation in this post, emphasizing crucial methods and advice to guarantee a smooth build. This guide will provide you the information and self-assurance to start your building project, regardless of your level of experience as a builder or as a first-time homeowner.

Step Description
1 Plan and mark the foundation layout
2 Excavate the trench to the required depth
3 Prepare the base with a layer of gravel and sand
4 Install the formwork for the foundation
5 Reinforce with steel bars
6 Pour the concrete mix into the formwork
7 Level and smooth the concrete surface
8 Allow the concrete to cure properly

Determination of the soil on the site for the foundation

You must thoroughly examine the soils before attempting the MZLF. Important parameters include the kind of soil, its bearing capacity, the amount of groundwater present, and its average freezing depth. It is best to order engineering and geological research prior to the project and construction commencing.

It is possible to conduct an independent examination if the soils are normal, as supported by the facts. Calculations and the determination of soil properties require a wide range of data, some of which are provided in the tables below:

Where can a shallow strip foundation be used

Soils that are normally non-heaving or slightly heaving can support a shallow strip foundation. If not, either a different kind of foundation structure is selected or the soil is replaced.

Building a shallow strip foundation on a peat bog is strictly forbidden. In the case of heterogeneous soil layers, when building at the intersections of various soil types, on extremely heaving, highly saturated soils, with a high water level, it is not advised to stop at this option.

In the event that the area has heaving soil and you wish to construct the specific kind of foundation, you will need to replace the soil beneath the foundation with coarse sand and gently compact the layer. Typically, a sand cushion has a thickness of 20 to 30 centimeters, but occasionally (such as on heaving soils) a layer as thick as 80 centimeters may be required.

It’s critical to construct high-quality drainage that can remove water from the foundation cushion efficiently if the waters are high. A blind area and an insulated base must be used with a shallow strip foundation.

Many people find that a shallow strip foundation is the best option because it uses a lot less concrete. Therefore, a deeper foundation—which can reach a depth of up to two meters—is poured below the freezing line.

Frost heaving does not cause the structure to compress from the bottom up in this instance. However, because of its insulated base and blind area, an insulated shallow strip lowers the freezing point.

Why do you need to know the weight of an aerated concrete house

The required width of the strip or sole of the foundation is determined by calculating the total weight of the house, whether it is constructed of aerated concrete or another material. The computed soil resistance is used to determine the support area.

Therefore, you must choose the ideal width for the foundation base so that the pressure on the soil is 20% less than the design resistance if you intend to build a two-story aerated concrete home on loam soil with design resistance of 1 kg/cm2. The walls of the home can be up to 40 centimeters thick and faced with brick.

– made of beams, planks, or wooden boards, installed in a trench or on the ground.

– Mastic-covered roofing felt sheets are placed on the tape’s base, allowed to adhere, and followed by the installation of appropriate insulation.

Depth of the foundation and height of the tape

Selecting the proper foundation depth is crucial for building a house made of aerated concrete, whether it is a one-story or two-story structure. Soil heaving, groundwater level, and soil freezing depth are a few examples of the indicators that affect this parameter.

  • The minimum depth of this type of foundation should be 50 centimeters.
  • The maximum height of the above-ground part of the structure (base) should be equal to four values ​​​​of the tape width.
  • Make sure that the above-ground part is not larger than the underground.
  • The optimal height of the above-ground part of the foundation is considered to be about 50 centimeters.

Foundation width

Aerated concrete homes must have a foundation that is at least 30 centimeters wide, but not any wider than the supported wall. Widening the tape by 40–50 centimeters is advised. However, it is preferable to carry out preliminary calculations using data regarding the site’s soil, the building’s weight, etc.

  • The weight of absolutely all elements of the building.
  • Useful load.
  • Wind load.
  • Snow load.

No more than 70% of the estimated soil resistance should be applied to the soil as a result of the building’s estimated mass. By strengthening the foundation’s heel (support), the specific load applied to the soil by the structure can be decreased.

A forty centimeter wide strip foundation is more than sufficient for an aerated concrete one- or two-story home.

  • 1.3 – safety factor.
  • L – strip length in centimeters.
  • P – house and foundation weight in kilograms.
  • Rо – soil resistance in kg/cm2.

Strip foundation reinforcement diagram

For a sturdy home and a good foundation, reinforcement is essential. Metal rods help to fortify the structure, improve its capacity to support varying loads, and prevent premature collapse.

  • The minimum diameter of all working reinforcement rods in the foundation should be equal to 0.1% of the foundation cross-section area.
  • Working reinforcement of longitudinal placement on sites longer than three meters should be 12 millimeters in diameter.
  • The maximum step between the working rods of longitudinal reinforcement is 40 centimeters.
  • The distance between the clamps should be a maximum of 40 centimeters.
  • The overlap of the reinforcement should be 50 centimeters.
  • A foundation strip more than 70 centimeters high requires the installation of structural longitudinal reinforcement.
  • The distance between the rows of longitudinal structural reinforcement should be less than 40 centimeters.
  • The cross-section of the transverse reinforcement should be at least 25% of the cross-section of the working longitudinal reinforcement (but not less than 6 millimeters).

As an illustration, the foundation strip has a height of one meter, or 1000 millimeters, and a width of 400 millimeters.

  • Foundation cross-section area is 1000 x 400 = 400,000 millimeters.
  • Total cross-section of the longitudinal reinforcement is 400,000 x 0.1 = 400 millimeters.
  • Search by table number/diameter of working rods.
  • A structural row of reinforcement is added to the frame.

For an aerated concrete home, a well-pounded strip foundation is essential to stability and longevity. This kind of foundation offers a stable and level base that can disperse the weight of the building in an even manner, avoiding settlement problems and cracks. You can create a solid foundation that efficiently supports your aerated concrete home by properly preparing the ground, using high-quality materials, and adhering to construction guidelines.

Table for selection of reinforcement bars

The ideal values for reinforcement are displayed in the table below. Examining the data for illustration, it appears that the following is the best choice for strengthening the designated foundation: For structural rows, there are four bars measuring twelve millimeters in cross-section and four bars measuring eight millimeters in diameter. Additionally, there is reinforcement with an eight millimeter cross-section for frame clamps.

Foundation waterproofing

There are two types of waterproofing that can be applied to a shallow foundation: vertical and horizontal. Because aerated concrete is highly hygroscopic and requires water protection, horizontal waterproofing is a necessary type of work that guards against capillary moisture suction from the base into the walls.

In addition to preventing moisture from getting to the concrete and reinforcement frame, vertical waterproofing also works to lessen the adherence of the concrete to frozen soil. The foundation’s service life is aided by the fact that tangential forces of frost heaving will not be able to adhere to it.

An essential step in ensuring the stability and longevity of an aerated concrete home is constructing a finely pounded strip foundation. A sturdy and dependable foundation that will support your house for many years can be achieved by adhering to a thorough process, which includes everything from site preparation to final curing.

Starting with appropriate planning and design is crucial. This include figuring out the type of soil, estimating the load-bearing capacity, and laying out the dimensions of the foundation. Precise excavation and formwork are necessary to guarantee proper foundation layout.

Care should be taken when mixing and pouring concrete to ensure proper consistency and complete compaction. By doing so, air pockets are reduced and a dense, sturdy foundation is achieved. In order to maximize the strength of the concrete, proper curing is essential.

You can create a finely ground strip foundation that will serve as a sturdy foundation for your aerated concrete home by following these instructions and paying close attention to every detail. Your home’s longevity and safety depend on you taking the time and making the effort to complete this process.

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Anna Vasilieva

Journalist with a technical education, specializing in construction topics. I can explain complex technical topics in simple and accessible language.

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